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Two pressures are measured for a blood pressure reading 1  : Systolic blood pressure is a measure of blood pressure while the heart is beating. 2  Diastolic pressure is a measure of blood pressure while the heart is relaxed.
Freebase(0.00 / 0 votes)Rate this definition: Diastole. Diastole is the period of time when the heart refills with blood after systole. Ventricular diastole is the period during which the ventricles are relaxing, while atrial diastole is the period during which the atria are relaxing. The term diastole originates from the Greek word Î´Î¹Î±ÏÏÎ¿Î»Î·, meaning dilation.